Virtual reality display device, lens barrel, and system

ABSTRACT

Embodiments of this application relate to a virtual reality display device. The virtual reality display device includes a left lens barrel and a right lens barrel; the left lens barrel includes: a left lens barrel housing, a left display screen, and a left lens; the right lens barrel includes: a right lens barrel housing, a right display screen, and a right lens; an inner side of an opening portion of the left lens barrel housing includes a left lens holder; an inner side of an opening portion of the right lens barrel housing includes a right lens holder; a left fill layer is provided between the left lens holder and the left lens; and a right fill layer is provided between the right lens holder and the right lens.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation application of PCT/CN2018/079760,entitled “VIRTUAL REALITY DISPLAY DEVICE, LENS BARREL, AND SYSTEM” filedon Mar. 21, 2018, which claims priority to Chinese Patent ApplicationNo. 201710193045.9, filed with the Chinese Patent Office on Mar. 28,2017 and entitled “VIRTUAL REALITY DISPLAY DEVICE, LENS BARREL, ANDSYSTEM”, all of which are incorporated by reference in their entirety.

FIELD OF THE TECHNOLOGY

This application relates to the field of virtual reality (VR), and inparticular, to a virtual reality display device, lens barrel, andsystem.

BACKGROUND OF THE DISCLOSURE

The virtual reality technology is a stimulation technology forgenerating, by using a VR system, an interactive three-dimensionalvisual scene and physical behaviors mixed with multi-source information.

In the VR technology, a presentation manner for the three-dimensionalvisual scene is usually as follows: A virtual reality display device inthe VR system is provided with a left lens barrel and a right lensbarrel, which respectively correspond to the left eye and the right eyeof a user. Each lens barrel is provided with a display screen and atleast one lens, and display screens in the left and right lens barrelsdisplay different content. The eyes of the user can observe virtualimages displayed on the display screens through the lenses, and thedifferent virtual images observed by the eyes of the user emergetogether and form a three-dimensional visual scene.

In the virtual reality display device, a distance between a virtualimage displayed on a display screen and an eye of a user is referred toas a virtual image distance (VID), and a distance between a displayscreen and a lens is referred to as a back focus length (Back FocusLength, BFL). The VID of a lens barrel is in positive correlation withthe BFL, to be specific, a larger BFL indicates a larger VID.

SUMMARY

An embodiment of this application provides a virtual reality displaydevice. The virtual reality display device includes a left lens barreland a right lens barrel.

The left lens barrel includes a left lens barrel housing, a left displayscreen, and a left lens; and the right lens barrel includes: a rightlens barrel housing, a right display screen, and a right lens.

An inner side of an opening portion of the left lens barrel housingincludes a left lens holder, the left display screen is mounted at thebottom of the left lens barrel housing, the left lens is mounted on aside of the left lens holder close to the opening portion of the leftlens barrel housing, and the left display screen is parallel to the leftlens.

An inner side of an opening portion of the right lens barrel housingincludes a right lens holder, the right display screen is mounted at thebottom of the right lens barrel housing, the right lens is mounted on aside of the right lens holder close to the opening portion of the rightlens barrel housing, and the right display screen is parallel to theright lens.

A left fill layer is provided between the left lens holder and the leftlens, and the left lens holder, the left fill layer, and the left lensare adhered together consecutively; and a right fill layer is providedbetween the right lens holder and the right lens, and the right lensholder, the right fill layer, and the right lens are adhered togetherconsecutively.

The thickness of the left fill layer is a difference between a presettarget distance and a first distance, the thickness of the right filllayer is a difference between the target distance and a second distance,the first distance is a distance between a surface of the left lensholder close to the opening portion of the left lens barrel housing andthe left display screen, and the second distance is a distance between asurface of the right lens holder close to the opening portion of theright lens barrel housing and the right display screen.

An embodiment of this application provides a virtual reality displaydevice. The virtual reality display device includes a left lens barreland a right lens barrel.

The left lens barrel includes a left lens barrel housing, a left displayscreen, and a left lens; and the right lens barrel includes: a rightlens barrel housing, a right display screen, and a right lens.

An inner side of an opening portion of the left lens barrel housingincludes a left lens holder, the left display screen is mounted at thebottom of the left lens barrel housing, the left lens is mounted on aside of the left lens holder close to the opening portion of the leftlens barrel housing, and the left display screen is parallel to the leftlens.

An inner side of an opening portion of the right lens barrel housingincludes a right lens holder, the right display screen is mounted at thebottom of the right lens barrel housing, the right lens is mounted on aside of the right lens holder close to the opening portion of the rightlens barrel housing, and the right display screen is parallel to theright lens.

A left fill layer is provided between the bottom of the left lens barrelhousing and the left display screen, and the left lens barrel housing,the left fill layer, and the left display screen are adhered togetherconsecutively; and a right fill layer is provided between the bottom ofthe right lens barrel housing and the right display screen, and theright lens barrel housing, the right fill layer, and the right displayscreen are adhered together consecutively.

A sum of the thickness of the left fill layer and the thickness of theleft display screen is a difference between a first distance and atarget distance, a sum of the thickness of the right fill layer and thethickness of the right display screen is a difference between a seconddistance and the target distance, the first distance is a distancebetween the left lens and the bottom of the left lens barrel housing,and the second distance is a distance between the right lens and thebottom of the right lens barrel housing.

An embodiment of this application provides a lens barrel of a virtualreality display device. The lens barrel includes: a lens barrel housing,a display screen, and a lens.

An inner side of an opening portion of the lens barrel housing includesa lens holder, the display screen is mounted at the bottom of the lensbarrel housing, the lens is mounted on a side of the lens holder closeto the opening portion of the lens barrel housing, and the displayscreen is parallel to the lens.

A fill layer is provided between the lens holder and the lens, and thelens holder, the fill layer, and the lens are adhered togetherconsecutively.

The thickness of the fill layer is a difference between a targetdistance and a first distance, and the first distance is a distancebetween a surface of the lens holder close to the opening portion of thelens barrel housing and the display screen.

An embodiment of this application further provides a lens barrel of avirtual reality display device. The lens barrel includes: a lens barrelhousing, a display screen, and a lens.

An inner side of an opening portion of the lens barrel housing includesa lens holder, the display screen is mounted at the bottom of the lensbarrel housing, the lens is mounted on a side of the lens holder closeto the opening portion of the lens barrel housing, and the displayscreen is parallel to the lens.

A fill layer is provided between the bottom of the lens barrel housingand the display screen, and the lens barrel housing, the fill layer, andthe display screen are adhered together consecutively.

A sum of the thickness of the fill layer and the thickness of thedisplay screen is a difference between a first distance and a targetdistance, and the first distance is a distance between the lens and thebottom of the lens barrel housing.

An embodiment of this application further provides a virtual realitysystem. The virtual reality system includes:

the virtual reality display device according to the embodiments of thisapplication.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings herein are incorporated in and constitute apart of the specification, illustrate embodiments of this application,and are used to explain the principle of this application together withthe specification.

FIG. 1 shows a schematic structural diagram of a virtual reality displaydevice according to an embodiment of this application.

FIG. 2 shows a side cross-sectional view of a lens holder according toan embodiment shown in FIG. 1.

FIG. 3 shows a top view of a lens holder according to the embodimentshown in FIG. 1.

FIG. 4 shows a comparison diagram of virtual image display according tothe embodiment shown in FIG. 1.

FIG. 5 shows a schematic diagram of an assembly procedure of a lensbarrel according to the embodiment shown in FIG. 1.

FIG. 6 shows a schematic diagram of an assembly procedure of anotherlens barrel according to the embodiment shown in FIG. 1.

FIG. 7 shows a schematic structural diagram of a virtual reality displaydevice according to an embodiment of this application.

FIG. 8 shows a schematic structural diagram of a lens barrel in avirtual reality display device according to an embodiment of thisapplication.

FIG. 9 shows another schematic structural diagram of the lens barrel ofthe virtual reality display device according to the embodiment shown inFIG. 8.

FIG. 10 shows a schematic structural diagram of a lens barrel in avirtual reality display device according to an embodiment of thisapplication.

FIG. 11 shows another schematic structural diagram of the lens barrel ofthe virtual reality display device according to the embodiment shown inFIG. 10.

FIG. 12 shows a schematic structural diagram of a virtual reality systemaccording to an embodiment of this application.

DESCRIPTION OF EMBODIMENTS

Exemplary embodiments are described in detail herein, and examples ofthe exemplary embodiments are shown in the accompanying drawings. Whenthe following descriptions relate to the accompanying drawings, unlessindicated otherwise, same numbers in different accompanying drawingsrepresent same or similar elements. The implementations described in thefollowing exemplary embodiments do not represent all implementationsconsistent with this application. On the contrary, the implementationsare merely examples of apparatuses and methods that are described indetail in the appended claims and that are consistent with some aspectsof this application.

FIG. 1 shows a schematic structural diagram of a virtual reality displaydevice according to an embodiment of this application. The virtualreality display device 10 includes: a left lens barrel 12 and a rightlens barrel 14.

The virtual reality display device 10 is a device worn by a user infront of eyes to display images. The virtual reality display device 10generally includes a wearing portion and a display portion. The wearingportion includes temples, an elastic band, and the like that areconfigured to wear the virtual reality display device 10 on the head ofa user. The display portion includes a left lens barrel 12 and a rightlens barrel 14. The virtual reality display device 10 can displaydifferent images through the left lens barrel 12 and the right lensbarrel 14, to present a three-dimensional visual scene to the user.

The left lens barrel 12 includes: a left lens barrel housing 121, a leftdisplay screen 122, and a left lens 123. The right lens barrel 14includes: a right lens barrel housing 141, a right display screen 142,and a right lens 143.

An inner side of an opening portion of the left lens barrel housing 121includes a left lens holder 124. An inner side of an opening portion ofthe right lens barrel housing 141 includes a right lens holder 144.

The left lens holder 124 and the left lens barrel housing 121 may be twoindependent components that are fixedly connected to each other; or theleft lens holder 124 and the left lens barrel housing 121 may beintegrated, for example, the left lens holder 124 may be a part of theleft lens barrel housing 121 extending to the inner side, or the leftlens holder 124 may be formed by outward recess of the left lens barrelhousing 121.

Similarly, the right lens holder 144 and the right lens barrel housing141 may be two independent components that are fixedly connected to eachother; or the right lens holder 144 and the right lens barrel housing141 may be integrated, that is, the right lens holder 144 may be a partof the right lens barrel housing 141 extending to the inner side; or theright lens holder 144 may be formed by outward recess of the right lensbarrel housing 141.

For example, FIG. 2 is a side cross-sectional view of the lens holderaccording to this embodiment of this application. In FIG. 2, FIG. (a) atthe lower left portion represents that lens holders 24 and lens barrelhousings 21 are of split structures, and the lens holders 24 are mountedin grooves on inner sides of the lens barrel housings 21. FIG. (b) atthe lower middle portion represents that the lens holders 24 and thelens barrel housings 21 are of integrated structures, and the lensholders 24 are formed by the inner sides of the lens barrel housings 21by protruding towards the center. FIG. (c) at the lower right portionrepresents that the lens holders 24 and the lens barrel housings 21 areof integrated structures, and the lens holders 24 are formed by theinner sides of the lens barrel housings 21 by recessing towards edges.

In some embodiments, the left lens holder 124 and the right lens holder144 are consecutive holder bands surrounding inner sides of respectivecorresponding lens barrel housings, or the left lens holder 124 and theright lens holder 144 each include several non-consecutive sub-holderssurrounding inner sides of respective corresponding lens barrelhousings.

For example, FIG. 3 is a top view of the lens holder according to thisembodiment of this application. In FIG. 3, FIG. (a) at the lower leftportion represents that a lens holder 34 is consecutively disposedaround an inner side of a lens barrel housing 31 by one circle. FIG. (b)at the lower right portion represents that the lens holder 34 isnon-consecutively disposed around the inner side of the lens barrelhousing 31 by one circle.

In FIG. 1, the left display screen 122 is mounted on an inner side ofthe left lens holder 124, and is close to the bottom of the left lensbarrel housing 121, the left lens 123 is mounted on an outer side (thatis, on a side close to the opening portion of the left lens barrelhousing 121) of the left lens holder 124, and the left display screen122 is parallel to the left lens 124; correspondingly, the right displayscreen 142 is mounted on an inner side of the right lens holder 144, andis close to the bottom of the right lens barrel housing 141, the rightlens 143 is mounted on an outer side (that is, a side close to theopening portion of the left lens barrel housing 141) of the right lensholder 144, and the right display screen 142 is parallel to the rightlens 143.

In this embodiment of this application, the display screen may befixedly disposed at the bottom of the lens barrel housing, the lens ismounted at the opening portion of the lens barrel housing, and the lensholder is configured to hold the lens.

In FIG. 1, a left fill layer 125 is provided between the left lensholder 124 and the left lens 123, and the left lens holder 124, the leftfill layer 125, and the left lens 123 are adhered togetherconsecutively; and correspondingly, a right fill layer 145 is providedbetween the right lens holder 144 and the right lens 143, and the rightlens holder 144, the right fill layer 145, and the right lens 143 areadhered together consecutively.

The thickness of the left fill layer 125 is a difference between atarget distance L₀ and a first distance L₁. The thickness of the rightfill layer 145 is a difference between the target distance L₀ and asecond distance L₂. The first distance L₁ is a distance between asurface of the left lens holder 124 close to the opening portion of theleft lens barrel housing 121 and the left display screen 122. The seconddistance L₂ is a distance between a surface of the right lens holder 144close to the opening portion of the right lens barrel housing 141 andthe right display screen 142. It should be noted that the targetdistance L₀ is determined according to a preset virtual image distance.The virtual image distance is a distance between a virtual imagedisplayed on a display screen and an eye of a user, and is a presetvalue that is set according to a specific virtual reality scenario, forexample, 1 meter or 2 meters.

In this embodiment of this application, the left fill layer 125 isconfigured to adjust a distance between the left display screen 122 andthe left lens 123 to the target distance L₀, and the right fill layer145 is configured to adjust a distance between the right display screen142 and the right lens 143 to the same target distance L₀. After beingfilled by the fill layer, the distances between the display screens inthe left and right lens barrels and the lenses are approximately thesame target distance.

The thickness of a fill layer is set according to a distance between adisplay screen and an upper surface of a lens holder after the displayscreen has been mounted. Specifically, the thickness of the fill layeris a difference between a distance from the display screen to the uppersurface of the lens holder and a standard BFL (that is, the targetdistance).

Correspondingly, for the virtual reality display device 10 in FIG. 1,the left fill layer 125 and the right fill layer 145 may have the samethickness or may have different thicknesses.

Specifically, when the display screen of the left and right lens barrelshave the same distance to the upper surfaces of the lens holders, theleft fill layer 125 and the right fill layer 145 also have the samethickness. When the display screen of the left and right lens barrelshave different distances to the upper surfaces of the lens holders, theleft fill layer 125 and the right fill layer 145 also have the differentthicknesses.

In actual application, mass-produced components may have a tolerance(that is, an allowed change in an actual parameter) due to insufficientpreciseness or the like. Specifically, for example, distances betweenbottoms of lens holders and mounting positions (for example, the bottomson the inner sides of the lens barrel housings in FIG. 1) of displayscreens may have a tolerance, the thicknesses of the lens holders mayhave a tolerance, and the thicknesses of the display screens may have atolerance. In a mounting process, the mounting preciseness also has atolerance. The tolerances of all the foregoing components aresuperposed. If the fill layers are not provided and the lenses aredirectly mounted on the lens holders, BFLs of the two lens barrelsdiffer a lot, and the difference between the BFLs of the left and rightlens barrels causes an even larger difference between VIDs of the twolens barrels. For example, it is assumed that a tolerance obtained bysuperposing tolerances of all components of a lens barrel may reach±0.35 mm. Table 1 shows a correspondence between a BFL and a VID of thelens barrel (a unit of the numbers in the table is millimeter).

TABLE 1 BFL + BFL + BFL + BFL − BFL − BFL − 0.35 0.2 0.1 BFL 0.1 0.20.35 BFL 41.75 41.60 41.50 41.40 41.30 41.20 41.05 VID 1300 1120 10601000 950 900 820

As shown in Table 1, in an alternative case, for a virtual realitydisplay device, when a tolerance between a BFL of one lens barrel of thevirtual reality display device and a standard BFL reaches +0.35 mm intotal, and a tolerance of a BFL of the other lens barrel and thestandard BFL reaches −0.35 mm in total, a difference between VIDs of thetwo lens barrels may reach 1300−820=480 (mm). However, a VID in thestandard BFL is only 1000 mm. In this case, a distance differencebetween virtual images observed by the left eye and the right eyereaches 480 mm. In this case, a user may not be able to clearly see athree-dimensional visual scene generated by superposing two virtualimages. This is unacceptable for use of the virtual reality displaydevice. In addition, even if the difference between the VIDs of the twolens barrels allows the user to clearly see the three-dimensional visualscene generated by superposing the two virtual images, it easily causesfatigue of the eyes of the user, and such a virtual reality displaydevice is not suitable for long term use.

In the virtual reality display device in this embodiment of thisapplication, a fill layer arranged according to a tolerance and amounting preciseness tolerance of actual components is disposed betweenthe lens holder and the lens, so that a distance (that is, the BFL)between the mounted display screen and the lens is as close to thetarget distance (that is, the standard BFL) as possible, VIDs of virtualimages finally displayed in different lens barrels remain consistent,and the user sees more clearly a three-dimensional visual scenegenerated by superposing virtual images, thereby improving the displayeffect of the three-dimensional visual scene in virtual reality.

Specifically, for example, FIG. 4 is a comparison diagram of virtualimage display according to an embodiment of this application. In FIG. 4,FIG. (a) on the left side is a schematic diagram of virtual imagedisplay when no fill layer is provided between lens holders and lenses.In this case, due to existence of a tolerance of components of a leftlens barrel and a right lens barrel and a tolerance of assemblytechnologies, BFLs of the left lens barrel and the right lens barrel maydiffer a lot. Consequently, VIDs of virtual images displayed in the leftlens barrel and the right lens barrel also differ a lot, and the displayeffect is poor. FIG. (b) on the right side is a schematic diagram ofvirtual image display when fill layers are provided between lens holdersand lenses. In this case, a tolerance of components of a left lensbarrel and a right lens barrel and a tolerance of assembly technologiesare adjusted by the fill layers, BFLs of the left lens barrel and theright lens barrel differ a little. Therefore, VIDs of virtual imagespresented in the left lens barrel and the right lens barrel areapproximately the same. In this case, the virtual images displayed inthe two lens barrels can be more easily superposed and emerged, and thedisplay effect is better.

In some embodiments, the left fill layer 124 and/or the right fill layer144 is a pad.

In this embodiment of this application, the fill layer between the lensholder and the lens may be a pad, and the pad may be made of a materialsuch as metal or rubber. The pad is respectively adhered to the lensholder and the lens by using a curing adhesive or a double facedadhesive tape.

In some embodiments, the pad includes at least one sub-pad having afixed thickness.

In actual application, because tolerances of components in differentlens barrels are inconsistent, the thicknesses of pads of the lensbarrels are also inconsistent. If pad having different thicknesses areproduced for different lens barrels, the production process and theassembly process are both relatively complex, and the assemblydifficulty is relatively high. In this embodiment of this application,the pad in each lens barrel may include relatively thin sub-pads havinga fixed thickness. For different lens barrels, during assembly, acorresponding quantity of sub-pads may be selected according to arequired thickness to form a pad configured to fill between the lens andthe lens holder.

For example, an example in which a tolerance obtained by superposingtolerances of all the components of the foregoing lens barrel may reach±0.35 mm is used. It may be set that each sub-pad has a thickness of0.05 mm. In an actual assembly process, if a required thickness isapproximately 0.05 mm, one sub-pad may be selected to form the foregoingpad; or if a required thickness is approximately 0.1 mm, two sub-padsmay be stacked to form the foregoing pad, and the rest can be deduced byanalogy.

For example, FIG. 5 is a schematic diagram of an assembly procedure of alens barrel according to an embodiment of this application. The assemblyprocedure is a procedure of mounting a lens after a display screen hasbeen mounted. Referring to FIG. 5, the procedure may be as follows:

Step 5 a. After a display screen is mounted at the bottom of a lensbarrel housing of a device, control a first mechanical component toplace a lens on an outer side of a lens holder and keep the lensclinging to the lens holder.

When the lens is assembled, the assembly device may not fill a padfirst, but directly place the lens on the lens holder. For example, acontroller in the assembly device may control the first mechanicalcomponent (for example, a mechanical arm capable of grasping the lens)to grasp the lens, and put the lens on the lens holder.

In some embodiments, the lens is not fixed to the lens holder. Toprevent the lens from dropping, during assembly, the assembly device mayfixedly place the lens barrel with the bottom facing downward and thetop facing upward.

Step 5 b. An image acquisition unit measures, through the lens, avirtual image distance between a virtual image displayed on the displayscreen and the image acquisition unit.

Specifically, the image acquisition unit may be a camera. A focal lengthof the camera and a virtual image distance (VID) that is captured by thecamera are pre-calibrated, in other words, the assembly device stores acorrespondence between distances of the focal length of the camera andthe VID.

In an assembly process, the display screen of the lens barrel displays avirtual image, the assembly device controls the camera to move to apredetermined position in front of the lens, the virtual image displayedon the display screen is focused through the lens, and after the focusis completed (that is, the virtual image acquired at this time is theclearest), the VID before the pad is filled can be determined accordingto a current focal length and the foregoing prestored correspondencebetween the focal length and the VID.

Step 5 c. Determine a pre-fill distance d₁ between the display screenand the lens according to a virtual image distance VID, and calculate adistance difference Δd between the pre-fill distance and a targetdistance dz.

When specifications of a display screen and a lens of a lens product arefixed, a relationship between a distance (that is, a BFL) from thedisplay screen to the lens of the lens product and a virtual imagedistance (VID) is also fixed. In this embodiment of this application,the assembly device may store a pre-calibrated correspondence (forexample, the correspondence shown in Table 1) between each BFL and eachVID. In step 5 c, after the VID is determined through query before thepad is filled, the pre-fill distance d₁ between the correspondingdisplay screen and lens may be directly queried, and the distancedifference Δd between the pre-fill distance and the target distance d₂is calculated.

Step 5 d. Control a second mechanical component to fill, between anouter side of the lens holder and the lens, a pad having a thickness ofthe distance difference.

In this embodiment of this application, several sub-pads having a fixedthickness may be preset, and each sub-pad has a relatively thinthickness (relative to the foregoing distance difference). When the padis filled, the controller may calculate a quantity of required sub-padsaccording to the foregoing distance difference. For example, after thedistance difference is divided by a sub-pad thickness, rounding up isperformed, and an obtained integer is the quantity of sub-pads.Subsequently, the controller controls the first mechanical component tomove away the lens, controls the second mechanical component to graspthe corresponding quantity of sub-pads and fill the grasped sub-padsonto the lens holder, and then controls the first mechanical componentto place the lens on the pad. Finally, the lens holder, the pad, and thelens are fixed by using a binder such as a double faced adhesive tape ora curing adhesive.

In some embodiments, before the lens holder, the pad, and the lens areadhered and fixed, the controller may further measure, by using theimage acquisition unit, a VID obtained after the pad is filled. If theVID obtained after the pad is filled satisfies a requirement, forexample, an error between the VID and a target VID is within an allowedrange, an operation of fixing the lens holder, the pad, and the lens isperformed; otherwise, a quantity of sub-pads is increased or decreasedaccording to a measurement result, till a VID obtained after the pad isfilled satisfies the requirement.

In some embodiments, the first mechanical component and the secondmechanical component may be the same mechanical component or may bedifferent mechanical components.

In some embodiments, the left fill layer 124 and/or the right fill layer144 is a curing adhesive.

In another possible implementation, alternatively, a curing adhesive maybe used as a fill layer. The curing adhesive is liquid in an initialstate. The liquid curing adhesive may be solidified into a solid curingadhesive in some particular conditions. In this embodiment of thisapplication, the curing adhesive may be an ultraviolet curing adhesiveor a moisture curing adhesive.

In some embodiments, the curing adhesive may alternatively be anothertype of curing adhesive, for example, a visible light curing adhesive.

For example, FIG. 6 is a schematic diagram of an assembly procedure ofanother lens barrel according to an embodiment of this application. Theassembly procedure is a procedure of mounting a lens after a displayscreen has been mounted. As shown in FIG. 6, the procedure may be asfollows:

Step 6 a. After the display screen has been mounted on an inner side ofa lens holder of a lens barrel housing of a device, control a thirdmechanical component to apply a sufficient amount of curing adhesive 61on the outer side of the lens holder.

In some embodiments, to prevent a liquid curing adhesive from flowing toa lower position, during assembly, the assembly device may place thelens barrel with the bottom facing downward and the top facing upward.When assembling the lens, the assembly device first applies sufficientliquid curing adhesive on the outer side of the lens holder (that is, anupper surface of the lens holder).

Step 6 b. Control a fourth mechanical component to grasp the lens, andplace the lens onto the liquid curing adhesive 61.

Step 6 c. Measure, by using an image acquisition unit through the lens,a virtual image distance between a virtual image displayed on thedisplay screen and the image acquisition unit, and move, by using thefourth mechanical component, the lens, to adjust a position of the lens.

A method for measuring a virtual image distance is similar to that inFIG. 5. The curing adhesive at this moment is liquid, and does notaffect movement of the lens. In this embodiment of this application, thecontroller can control the fourth mechanical component to grasp the lensand move the lens up and down.

Step 6 d. When the measured virtual image distance satisfies acondition, control the third mechanical component to solidify the liquidcuring adhesive 61 into a solid curing adhesive 62.

The controller may control, each time the fourth mechanical componentmoves the lens, the fourth mechanical component to measure a new VID byusing the image acquisition unit; and when the measured VID satisfies arequirement, for example, an error between the measured VID and thetarget VID is within an allowed range, control the third mechanicalcomponent to solidify the curing adhesive. For example, when the curingadhesive is an ultraviolet curing adhesive, the controller may controlthe third mechanical component to irradiate the liquid curing adhesiveby using ultraviolet light, so that the liquid curing adhesive issolidified, so as to fix a distance (that is, a BFL) between the lensand the display screen.

In conclusion, in the solution shown in this embodiment of thisapplication, in the lens barrel of the virtual reality display device, afill layer is provided between the lens and the lens holder for fixingthe lens, so that a distance between the display screen and the lens isa target distance, and further, VIDs of virtual images displayed in leftand right lens barrels of the virtual reality display device are asclose as possible. In this way, the virtual images displayed in the leftand right lens barrels can be more easily superposed and emerged,thereby improving the display effect of a three-dimensional visual scenein virtual reality.

FIG. 7 is a schematic structural diagram of a virtual reality displaydevice according to an embodiment of this application. The virtualreality display device 70 includes: a left lens barrel 72 and a rightlens barrel 74.

The left lens barrel 72 includes: a left lens barrel housing 721, a leftdisplay screen 722, and a left lens 723. The right lens barrel 74includes: a right lens barrel housing 741, a right display screen 742,and a right lens 743.

An inner side of an opening portion of the left lens barrel housing 721includes a left lens holder 724. An inner side of an opening portion ofthe right lens barrel housing 741 includes a right lens holder 744.

For a connection structure between the lens holder and the lens barreland an arrangement manner of the lens holder, refer to FIG. 2 and FIG.3. Details are not described herein again.

In this embodiment of this application, the display screen may befixedly disposed at the bottom of the lens barrel housing, the lens ismounted at the opening portion of the lens barrel housing, and the lensholder is configured to hold the lens.

In FIG. 7, a left fill layer 725 is provided between the bottom of theleft lens barrel housing 721 and the left display screen 722, and theleft lens barrel housing 721, the left fill layer 725, and the leftdisplay screen 722 are adhered together consecutively; and a right filllayer 745 is provided between the bottom of the right lens barrelhousing 741 and the right display screen 742, and the right lens barrelhousing 741, the right fill layer 745, and the right display screen 742are adhered together consecutively.

A sum of the thickness of the left fill layer 725 and the thickness ofthe left display screen 722 is a difference between a first distance L₁and a target distance L₀. A sum of the thickness of the right fill layer745 and the thickness of the right display screen 742 is a differencebetween a second distance L₂ and the target distance L₀. The firstdistance L₁ is a distance between the left lens 723 and the bottom ofthe left lens barrel housing 721. The second distance L₂ is a distancebetween the right lens 743 and the bottom of the right lens barrelhousing 741.

In this embodiment of this application, the left fill layer 725 isconfigured to adjust a distance between the left display screen 722 andthe left lens 723 to the target distance L₀, and the right fill layer745 is configured to adjust a distance between the right display screen742 and the right lens 743 to the same target distance L₀. After beingfilled by the fill layer, the distances between the display screens inthe left and right lens barrels and the lenses are approximately thesame target distance.

The thickness of a fill layer is set according to a distance between alens and the bottom of a lens barrel housing after the lens has beenmounted. Specifically, the thickness of the fill layer is a differencebetween a distance from a display screen to an upper surface of a lensholder and a standard BFL (that is, the target distance) minus thethickness of the display screen.

Correspondingly, for the virtual reality display device 70 in FIG. 7,the left fill layer 725 and the right fill layer 745 may have the samethickness or may have different thicknesses.

In some embodiments, the left fill layer 725 and/or the right fill layer745 is a pad.

In this embodiment of this application, the fill layer between the lensholder and the lens may be a pad, and the pad may be made of a materialsuch as metal or rubber. The pad is respectively adhered to the lensholder and the lens by using a curing adhesive or a double facedadhesive tape.

In some embodiments, the pad includes at least one sub-pad having afixed thickness.

In some embodiments, the left fill layer 724 and/or the right fill layer744 is a curing adhesive.

In another possible implementation, alternatively, a curing adhesive maybe used as a fill layer. The curing adhesive is liquid in an initialstate. The liquid curing adhesive may be solidified into a solid curingadhesive in some particular conditions. In this embodiment of thisapplication, the curing adhesive may be an ultraviolet curing adhesiveor a moisture curing adhesive.

In some embodiments, the curing adhesive may alternatively be anothertype of curing adhesive, for example, a visible light curing adhesive.

In conclusion, in the solution shown in this embodiment of thisapplication, in the lens barrel of the virtual reality display device, afill layer is provided between the bottom of the lens barrel housing andthe display screen, so that a distance between the display screen andthe lens is a target distance, and further, VIDs of virtual imagesdisplayed in left and right lens barrels of the virtual reality displaydevice are as close as possible. In this way, the virtual imagesdisplayed in the left and right lens barrels can be more easilysuperposed and emerged, thereby improving the display effect of athree-dimensional visual scene in virtual reality.

FIG. 8 is a schematic structural diagram of a lens barrel in a virtualreality display device according to an embodiment of this application.The lens barrel 80 may include a lens barrel housing 81, a displayscreen 82, and a lens 83.

An inner side of an opening portion of the lens barrel housing 81includes a lens holder 84. The display screen 82 is mounted at thebottom of the lens barrel housing 81, the lens is mounted on a side ofthe lens holder 84 relative to an opening portion of the lens barrelhousing 81, and the display screen 82 is parallel to the lens 83.

For structures of the lens holder 84 and the lens barrel housing 81,refer to FIG. 2 or FIG. 3. Details are not described herein again.

A fill layer 85 is provided between the lens holder 84 and the lens 83;and the lens holder 84, the fill layer 85, and the lens 83 are adheredtogether consecutively. The thickness of the fill layer 85 is adifference between a target distance L₀ and a first distance L₁, and thefirst distance L₁ is a distance between a surface of the lens holder 84close to the opening portion of the lens barrel housing 81 and thedisplay screen 82.

In some embodiments, the fill layer 85 is a pad.

In some embodiments, the pad includes at least one sub-pad having afixed thickness.

In some embodiments, the fill layer 85 is a curing adhesive.

In some embodiments, the curing adhesive is an ultraviolet curingadhesive or a moisture curing adhesive.

For the fill layer 85, refer to the description in the embodiment shownin FIG. 1; for a method for assembling the fill layer 85, refer to FIG.5 or FIG. 6; and details are not described herein again.

In this embodiment of this application, the lens barrel may be a part ofthe virtual reality display device. Specifically, for example, merchantscan split the lens barrel and other components of the virtual realitydisplay device for sale. After purchasing all components, including twolens barrels, required for one virtual reality display device, a usermay assemble the virtual reality display device. Alternatively, inanother possible scenario, if one of two lens barrels of a virtualreality display device owned by a user is damaged, the user canseparately purchase a new lens barrel and replace the damaged lensbarrel with the new lens barrel. Because in different lens barrels,after adjustment by fill layers, distances between display screens andlenses are all close to a target distance, VIDs of virtual imagesdisplayed in left lens barrels and right lens barrels after virtualreality display devices are assembled are approximately the same. Inthis case, virtual images displayed in each pair of left and right lensbarrels can be more easily superposed and emerged, and the displayeffect is better.

In some embodiments, FIG. 9 is another schematic structural diagram ofthe lens barrel of the virtual reality display device according to thisembodiment of this application. In FIG. 9, the display area on thedisplay screen 82 includes a left display area 82 a and a right displayarea 82 b; the lens 83 includes a left lens portion 83 a and a rightlens portion 83 b; and the center of the left display area 82 a exactlyfaces the center of the left lens portion 83 a, and the center of theright display area 82 b exactly faces the center of the right lensportion 83 b.

In this embodiment of this application, a virtual image observed by theleft eye of a user may be displayed on the same display screen.Correspondingly, lenses corresponding to the left eye and the right eyemay be an integrated lens. During actual use, the left display area ofthe display screen displays a virtual image corresponding to the lefteye of the user, and the right display area displays a virtual imagecorresponding to the right eye of the user. The left eye of the userobserves, through the left lens portion, a virtual image displayed inthe left display area, and the right eye observes, through the rightlens portion, a virtual image displayed in the right display area. Thevirtual images respectively observed by the two eyes can achieve aneffect of a three-dimensional visual scene after the virtual images aresuperposed and emerged.

In some embodiments, in FIG. 9, to ensure the display effect of thevirtual images observed by the left and right eyes, the left and rightdisplay areas may be isolated. Specifically, the lens barrel housing 81may further include an isolating layer 86. The isolating layer 86 ismade of a non-light-transmissive material. One end of the isolatinglayer 86 is close to or clings to the center line between the leftdisplay area 82 a and the right display area 82 b, and the other end ofthe isolating layer 86 is close to or clings to the center line betweenthe left lens portion 83 a and the right lens portion 83 b. In addition,two sides of the isolating layer 86 extend to the lens barrel housing81.

In conclusion, in the solution shown in this embodiment of thisapplication, in the lens barrel of the virtual reality display device, afill layer is provided between the lens and the lens holder for fixingthe lens, so that a distance between the display screen and the lens isa target distance, and further, VIDs of virtual images displayed in leftand right lens barrels of the virtual reality display device are asclose as possible. In this way, the virtual images displayed in the leftand right lens barrels of the virtual reality display device can be moreeasily superposed and emerged, thereby improving the display effect ofthree-dimensional visual scene in virtual reality.

FIG. 10 is a schematic structural diagram of a lens barrel in a virtualreality display device according to an embodiment of this application.The lens barrel 100 may include a lens barrel housing 101, a displayscreen 102, and a lens 103.

An inner side of an opening portion of the lens barrel housing 101includes a lens holder 104. The display screen 102 is mounted at thebottom of the lens barrel housing 101, the lens is mounted on a side ofthe lens holder 104 relative to an opening portion of the lens barrelhousing 101, and the display screen 102 is parallel to the lens 103.

For structures of the lens holder 104 and the lens barrel housing 101,refer to FIG. 2 or FIG. 3. Details are not described herein again.

A fill layer 105 is provided between the lens holder 104 and the lens103; and the lens holder 104, the fill layer 105, and the lens 103 areadhered together consecutively. A sum of the thickness of the fill layer105 and the thickness of the display screen 102 is a difference betweena target distance L₀ and a first distance L₁, and the first distance L₁is a distance between a surface of the lens holder 104 close to theopening portion of the lens barrel housing 101 and the display screen102.

In some embodiments, the fill layer 105 is a pad.

In some embodiments, the pad includes at least one sub-pad having afixed thickness.

In some embodiments, the fill layer 105 is a curing adhesive.

In some embodiments, the curing adhesive is an ultraviolet curingadhesive or a moisture curing adhesive.

For the fill layer 105, refer to the description in the embodiment shownin FIG. 1. Details are not described herein again.

In some embodiments, FIG. 11 is another schematic structural diagram ofthe lens barrel of the virtual reality display device according to thisembodiment of this application. In FIG. 11, the display area on thedisplay screen 102 includes a left display area 102 a and a rightdisplay area 102 b; the lens 103 includes a left lens portion 103 a anda right lens portion 103 b; and the center of the left display area 102a exactly faces the center of the left lens portion 103 a, and thecenter of the right display area 102 b exactly faces the center of theright lens portion 103 b.

In some embodiments, in FIG. 10, to ensure the display effect of thevirtual images observed by the left and right eyes, the left and rightdisplay areas may be isolated. Specifically, the lens barrel housing 101may further include an isolating layer 106. The isolating layer 106 ismade of a non-light-transmissive material. One end of the isolatinglayer 106 is close to or clings to the center line between the leftdisplay area 102 a and the right display area 102 b, and the other endof the isolating layer 106 is close to or clings to the center linebetween the left lens portion 103 a and the right lens portion 103 b. Inaddition, two sides of the isolating layer 106 extend to the lens barrelhousing 101.

In conclusion, in the solution shown in this embodiment of thisapplication, in the lens barrel of the virtual reality display device, afill layer is provided between the bottom of the lens barrel housing andthe display screen, so that a distance between the display screen andthe lens is a target distance, and further, VIDs of virtual imagesdisplayed in left and right lens barrels of the virtual reality displaydevice are as close as possible. In this way, the virtual imagesdisplayed in the left and right lens barrels of the virtual realitydisplay device can be more easily superposed and emerged, therebyimproving the display effect of a three-dimensional visual scene invirtual reality.

FIG. 12 is a schematic structural diagram of a VR system according to anembodiment of this application. The VR system includes a virtual realitydisplay device 122.

The virtual reality display device 122 may be the virtual realitydisplay device shown in FIG. 1 or FIG. 7.

In some embodiments, the VR system may further include a virtual realityhost 124 and an input device 126.

The virtual reality display device 122, the virtual reality host 124,and the input device 126 may be devices independent of each other; ortwo of the virtual reality display device 122, the virtual reality host124, and the input device 126 may be integrated into a same device, andthe remaining device is an independent device; or the virtual realitydisplay device 122, the virtual reality host 124, and the input device126 may be integrated into a same device.

Optionally, the virtual reality display device 122 may further beprovided with a motion sensor, configured to capture an action of aportion (for example, the head) of a user wearing the virtual realitydisplay device 122, so that the virtual reality host 124 changes adisplay picture in the virtual reality display device 122.

In some embodiments, the virtual reality display device 122 iselectrically connected to the virtual reality host 124 through aflexible circuit board, a hardware interface, a data line, or a wirelessnetwork. The virtual reality host 124 is connected to the input device126 through a cable, a Bluetooth connection, or a wireless fidelity(Wi-Fi) connection.

The virtual reality host 124 is configured to: model a three-dimensionalvirtual environment, generate a three-dimensional display picturecorresponding to the three-dimensional virtual environment, generate avirtual object in the three-dimensional virtual environment, and so on.Certainly, the virtual reality host 124 may also model a two-dimensionalvirtual environment, generate a two-dimensional display picturecorresponding to the two-dimensional virtual environment, and generate avirtual object in the two-dimensional virtual environment; or thevirtual reality host 124 may model a three-dimensional virtualenvironment, generate, according to a position of an angle of view of auser, a two-dimensional display picture corresponding to thethree-dimensional virtual environment, generate a two-dimensionalprojection picture of a virtual object in the three-dimensional virtualenvironment, and so on. This is not limited in this embodiment.

The virtual reality host 124 receives an input signal of the inputdevice 126, and generates a display picture of the virtual realitydisplay device 122 according to the input signal. The virtual realityhost 124 is usually implemented by electronic components such as aprocessor, a memory, and an image virtual reality host that are disposedon a circuit board. Optionally, the virtual reality host 124 furtherincludes an image acquisition apparatus.

The input device 126 may be at least one external input device of asomatosensory glove, a somatosensory handset, a remote control, atreadmill, a mouse, a keyboard, and an eye focus device.

A person skilled in the art upon consideration of the specification andpractice of this application disclosed herein will readily appreciateother embodiments of this application. This application is intended tocover any variations, uses, or adaptations of the embodiments of thisapplication, and the variations, uses, or adaptations follow a generalprinciple of the embodiments of this application and include commonsense or common technical means in this technical field that are notdisclosed in the embodiments of this application. The specification andthe embodiments are merely exemplary, and the actual scope and spirit ofthe embodiments of this application are subject to the following claims.

It should be understood that the embodiments of this application are notlimited to the foregoing described precise structures shown in theaccompanying drawings, but may be modified and changed without departingfrom the scope of the embodiments of this application. The scope of theembodiments of this application is merely limited by the appendedclaims.

What is claimed is:
 1. A virtual reality display device, comprising aleft lens barrel and a right lens barrel; the left lens barrelcomprising: a left lens barrel housing, a left display screen, and aleft lens; and the right lens barrel comprising: a right lens barrelhousing, a right display screen, and a right lens; an inner side of anopening portion of the left lens barrel housing comprising a left lensholder, the left display screen being mounted at a bottom of the leftlens barrel housing, the left lens being mounted on one side of the leftlens holder close to the opening portion of the left lens barrelhousing, and the left display screen being parallel to the left lens; aninner side of an opening portion of the right lens barrel housingcomprising a right lens holder, the right display screen being mountedat a bottom of the right lens barrel housing, the right lens beingmounted on one side of the right lens holder close to the openingportion of the right lens barrel housing, and the right display screenbeing parallel to the right lens; a left fill layer being providedbetween the left lens holder and the left lens, and the left lensholder, the left fill layer, and the left lens being adhered togetherconsecutively; and a right fill layer being provided between the rightlens holder and the right lens, and the right lens holder, and the rightfill layer, and the right lens being adhered together consecutively; anda thickness of the left fill layer being a difference between a presettarget distance and a first distance, a thickness of the right filllayer being a difference between the preset target distance and a seconddistance, the first distance being a distance between a surface of theleft lens holder close to the opening portion of the left lens barrelhousing and the left display screen, and the second distance being adistance between a surface of the right lens holder close to the openingportion of the right lens barrel housing and the right display screen,wherein the left fill layer and the right fill layer have differentthicknesses.
 2. The virtual reality display device according to claim 1,wherein the preset target distance is determined according to a presetvirtual image distance, and the preset virtual image distance is adistance between a virtual image displayed on a display screen and aneye of a user.
 3. The virtual reality display device according to claim1, wherein each of the left fill layer and the right fill layer is apad.
 4. The virtual reality display device according to claim 3, whereinthe pad comprises at least one sub-pad having a fixed thickness.
 5. Thevirtual reality display device according to claim 1, wherein each of theleft fill layer and the right fill layer is made of curing adhesive. 6.The virtual reality display device according to claim 5, wherein thecuring adhesive is an ultraviolet curing adhesive or a moisture curingadhesive.
 7. The virtual reality display device according to claim 1,wherein a display area on the display screen comprises a left displayarea and a right display area; and the lens comprises a left lensportion and a right lens portion; and a center of a left display area ofthe left display screen exactly faces a center of a left lens portion ofthe left lens, and a center of a right display area of the right displayscreen exactly faces a center of a right lens portion of the right lens.8. The virtual reality display device according to claim 7, wherein eachlens barrel housing further comprises a nontransparent isolating layer;a bottom of the nontransparent isolating layer is close to or clings toa centerline between the left display area and the right display area; atop of the nontransparent isolating layer is close to or clings to acenterline between the left lens portion and the right lens portion; andtwo sides of the nontransparent isolating layer extend to the lensbarrel housing.
 9. A virtual reality system, comprising: a virtualreality display device comprising a left lens barrel and a right lensbarrel; the left lens barrel comprising: a left lens barrel housing, aleft display screen, and a left lens; and the right lens barrelcomprising: a right lens barrel housing, a right display screen, and aright lens; an inner side of an opening portion of the left lens barrelhousing comprising a left lens holder, the left display screen beingmounted at a bottom of the left lens barrel housing, the left lens beingmounted on one side of the left lens holder close to the opening portionof the left lens barrel housing, and the left display screen beingparallel to the left lens; an inner side of an opening portion of theright lens barrel housing comprising a right lens holder, the rightdisplay screen being mounted at a bottom of the right lens barrelhousing, the right lens being mounted on one side of the right lensholder close to the opening portion of the right lens barrel housing,and the right display screen being parallel to the right lens; a leftfill layer being provided between the left lens holder and the leftlens, and the left lens holder, the left fill layer, and the left lensbeing adhered together consecutively; and a right fill layer beingprovided between the right lens holder and the right lens, and the rightlens holder, and the right fill layer, and the right lens being adheredtogether consecutively; and a thickness of the left fill layer being adifference between a preset target distance and a first distance, athickness of the right fill layer being a difference between the presettarget distance and a second distance, the first distance being adistance between a surface of the left lens holder close to the openingportion of the left lens barrel housing and the left display screen, andthe second distance being a distance between a surface of the right lensholder close to the opening portion of the right lens barrel housing andthe right display screen, wherein the left fill layer and the right filllayer have different thicknesses.
 10. The virtual reality systemaccording to claim 9, wherein the preset target distance is determinedaccording to a preset virtual image distance, and the preset virtualimage distance is a distance between a virtual image displayed on adisplay screen and an eye of a user.
 11. The virtual reality systemaccording to claim 9, wherein each of the left fill layer and the rightfill layer is a pad.